Stainless steel headed helical nails designed to fix counterbatten to rafter in flat and warm roof systems without compressing the insulation layer. Available in 145mm, 170mm, and 195mm lengths.
Available options and pricing for Super 8 Thor HEADED Helical Nail for Flat Roofs, with quantity selectors and a running total
Size
SKU
Price
QTY
Total
145mm
II145HEL8100
£30.68£36.82
—
170mm
II170HEL8100
£43.29£51.95
—
195mm
II195HEL8100
£46.43£55.72
—
The Super 8 Thor Headed Helical Nail is a specialist fixing for flat and warm roof construction, engineered specifically to fasten counterbattens to rafters across an insulation layer without crushing or compressing it. That last bit matters more than it sounds. Compress the insulation and you lose the thermal performance you just paid to install. These nails are designed to bridge that gap cleanly, landing flush with the timber on both sides.
Manufactured from stainless steel and formed with the patented Thor-Helical helix profile, the Super 8 Thor headed helical nail delivers genuine holding power rather than just relying on friction alone. The helical shank bites into timber as it drives, which means it resists withdrawal far better than a smooth or even ring-shanked equivalent. On a flat roof, where differential movement and wind uplift are constant long-term concerns, that kind of pull-out resistance is worth having.
Where Super 8 Thor Headed Helical Nails Fit Into Roof Construction
These nails are used across new build and refurbishment roofing projects wherever counterbattens are being fixed over insulation to rafters. The headed design ensures the batten cannot pull over the fixing under load, and the stainless steel construction means there is no corrosion risk in a roof environment where trapped moisture is always a possibility. They are manufactured in line with NHBC standards, which keeps things straightforward on warranty-backed new build sites.
Available in three lengths: 145mm, 170mm, and 195mm. The right size depends on your combined batten and insulation depth, so it is worth working this out before ordering rather than after. As a rough guide, you want the nail to achieve solid penetration into the rafter beyond the insulation layer, so measure carefully and size up if you are in any doubt.
Stainless steel throughout, NHBC-compliant, and built around a proven helical profile. If you are fixing counterbattens over insulation on a flat roof, this is the correct tool for the job.
Pro Tip: Always calculate your required nail length by adding the batten thickness plus the full insulation depth plus a minimum 40mm rafter penetration, then round up to the next available size rather than cutting it close.
Super 8 Thor Headed Helical Nails are used in flat and warm roof construction where counterbattens need to be fixed through or over insulation boards to the structural rafters below. Common applications include new build residential roofing on NHBC-registered sites, warm roof refurbishments, and any project where maintaining the integrity of the insulation layer is critical to the thermal specification. Roofing contractors, main contractors, and self-builders working to current building regulations will all encounter situations where these are the correct fixing to specify.
Best For
Fixing counterbattens to rafters over insulation
Flat and warm roof construction
New build NHBC-registered roofing projects
Warm roof refurbishment
Timber-framed roof structures
Compatible With
Timber rafters and counterbattens
Rigid insulation board systems
NHBC standards
Warm roof build-up configurations
Key Specifications
Available in 145mm, 170mm, and 195mm
Stainless steel construction
Patented Thor-Helical helix profile
Headed design for batten retention under load
Flush installation to timber
NHBC compliant
Not suitable for: Not suitable for pitched roof batten applications where standard clout nails or standard ring-shank fixings are specified. These are designed specifically for counterbatten-over-insulation flat roof details and should not be used as a general-purpose timber nail.
Before fixing, calculate the correct nail length by adding together the thickness of the counterbatten, the full depth of the insulation layer, and a minimum 40mm penetration into the rafter. Select the nail size that meets or exceeds this figure from the available lengths: 145mm, 170mm, or 195mm.
Drive the nails using a suitable hammer or nail gun capable of handling the helical shank profile. The helical geometry means the nail rotates slightly as it drives, so consistent straight driving is important to avoid the nail skewing in the timber. Fix at centres specified by your roof design or as required by NHBC guidance for the batten and insulation combination in use.
Calculate the required nail length: counterbatten thickness plus insulation depth plus a minimum 40mm rafter penetration.
Select the appropriate nail size from 145mm, 170mm, or 195mm based on your calculation, sizing up where the figures fall between lengths.
Position the counterbatten over the insulation layer, aligned with the rafter below.
Drive the headed helical nail through the batten and insulation into the rafter, keeping the nail perpendicular to the batten face throughout.
Confirm the nail head sits flush with the batten surface without over-driving.
Fix at centres appropriate to your roof specification and NHBC requirements.
How do I choose between the 145mm, 170mm, and 195mm lengths?
Add the thickness of your counterbatten to the full depth of the insulation layer, then add at least 40mm for rafter penetration. Choose the nail length that meets or exceeds this total. If your calculation falls between two sizes, always go with the longer nail. Under-penetrating the rafter significantly reduces holding power, which is not a risk worth taking on a flat roof.
Are these nails suitable for use on NHBC warranty-backed new build sites?
Yes. The Super 8 Thor Headed Helical Nails are manufactured in line with NHBC standards, making them straightforward to specify and sign off on new build residential projects. If your building inspector or warranty provider requires confirmation of compliance, the NHBC alignment of these fixings covers that requirement.
The Super 8 Thor Headed Helical Nail is manufactured from stainless steel, providing long-term corrosion resistance in the damp, enclosed environment typical of a warm or flat roof build-up. The shank features the patented Thor-Helical profile, a precision-engineered helix that drives the nail with a rotational action and significantly increases withdrawal resistance compared to smooth or ring-shank alternatives. The headed design prevents the counterbatten from pulling through under load or wind uplift.
Material
Stainless steel
Shank Profile
Thor-Helical patented helix
Head Type
Headed
Available Lengths
145mm, 170mm, 195mm
Compliance
NHBC standards
Application
Counterbatten to rafter fixing over insulation
Size
145mm, 170mm, 195mm
Reviews
There are no reviews yet.
Be the first to review “Super 8 Thor HEADED Helical Nail for Flat Roofs”Cancel Reply
Reviews
There are no reviews yet.